Georgia REScheck & Manual J Requirements, Explained: The 2015 IECC and Georgia's Own Amendments

1. What the Code Is and Who Enforces It

Georgia's residential energy code is the Georgia State Minimum Standard Energy Code: the 2015 International Energy Conservation Code (IECC), adopted together with Georgia's own state supplements and amendments layered on top. The current rule on the books - Ga. Comp. R. & Regs. R. 110-11-1-.34 - carries the title "International Energy Conservation Code (IECC), 2015 Edition with 2020, 2022, 2022 Additional and 2023 Georgia State Amendments." There is no separate 2018-, 2021-, or 2024-based residential energy code in Georgia; the base edition has stayed at 2015 since the current amendment cycle began.¹

The code is adopted and administered by the Georgia Department of Community Affairs (DCA), Office of Construction Codes and Industrialized Buildings, under authority granted by O.C.G.A. § 8-2-23. DCA sets the statewide minimum; day-to-day plan review and permitting is handled locally, by the building department (or, in some jurisdictions, a contracted third party) for the city or county where the project sits.⁴

Who it affects: anyone pulling a residential building permit for a one- or two-family dwelling, townhouse, or (through the code's existing-building provisions) many addition and alteration projects. Chapter 4 [RE] Residential Energy Efficiency is the operative chapter; its "Mandatory" sections apply no matter which compliance path you choose.¹

The part most out-of-state builders and even some in-state ones miss: on December 9, 2025, DCA's Board adopted a sweeping refresh of Georgia's other model codes, effective January 1, 2026 - the 2024 IRC, 2024 IBC, 2024 IPC, 2024 IMC, 2024 IFGC, 2024 ISPSC, and 2026 amendments to the 2023 National Electrical Code all moved forward. The energy code was not on that list. DCA's own January 2026 Industrialized Buildings code-reference sheet confirms it explicitly, listing the current energy-code line item as "2015 International Energy Conservation Code (IECC) w/ 2020, 2022 & 2023 GA Amendments" alongside the newly-adopted 2024-based codes.⁴⁵ In practical terms: your 2026 Georgia permit set will reference 2024-edition structural and mechanical codes sitting next to a 2015-edition energy code - that is correct and expected, not a mismatch to flag.

Compliance paths

Georgia's amended Section R401.2 gives four routes to compliance, all requiring the Chapter 4 "Mandatory" provisions regardless of which one you pick:¹⁹

1. Sections R401 through R404 (the prescriptive path - hit every line of the envelope table).
2. Section R405 (simulated performance - a full energy model against a standard reference design).
3. Section R406 (Energy Rating Index / ERI - a HERS-style scored rating against Georgia's own target).
4. The most recent version of REScheck, keyed to the 2015 IECC.

That fourth option is worth pausing on. Georgia's own amendment document is explicit about it: "When following the REScheck compliance pathway, select the 2015 IECC as the code version."² The DOE REScheck tool will happily let a user pick the 2018, 2021, or 2024 IECC from a dropdown - none of those is correct for a Georgia permit. There is also no separate Georgia-specific edition inside the tool the way a handful of other states have; the plain "2015 IECC" selection, with inputs matched to Georgia's amended tables, is the correct document. Georgia's DOE state profile confirms REScheck use is accepted for both the commercial and residential paths.³

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2. What the Georgia Amendments Actually Change

Georgia didn't adopt the 2015 IECC unamended. Several of the state's changes make its rules looser than the plain national 2015 text for Georgia's own climate zones - which is the opposite direction from most states' amendment patterns, and worth knowing before you over-spec a job. Others simply add Georgia-specific procedure. Here is what the adopted rule text and DCA's amendment documents actually say, section by section.

Building envelope - Table R402.1.2 (Insulation and Fenestration Requirements)

Georgia's climate zones are 2, 3, and 4 (except Marine) - no Georgia county falls in Zone 1, 3B, 3C, or above Zone 4. Georgia's amended Table R402.1.2 sets these values, verified directly against the adopted rule text:⁶

Component	Zone 2	Zone 3	Zone 4 (except Marine)
Fenestration U-factor (max)	0.35	0.35	0.35
Skylight U-factor (max)	0.65	0.55	0.55
Glazed fenestration SHGC (max)	0.27	0.27	0.27
Ceiling R-value	R-38	R-38	R-38
Wood frame wall R-value	R-13	R-13	R-13
Attic kneewall R-value	R-18	R-18	R-18
Mass wall R-value	4/6	8/13	8/13
Floor R-value	R-13	R-19	R-19
Basement wall R-value	0	5/13	10/13
Slab R-value & depth	0	0	0
Crawl space wall R-value	0	5/13	10/13

Source: Table R402.1.2, Georgia State Supplements and Amendments to the 2015 IECC, as adopted in Ga. Comp. R. & Regs. R. 110-11-1-.34.⁶

The line most builders don't expect: slab R-value is 0 in every zone Georgia uses. Georgia's own supporting documentation for this table states plainly why: "Slab insulation is not required in Georgia due to termite risk" - continuous foam at the slab edge creates a hidden path for termite entry that conflicts with the state's termite-treatment requirements, so DCA zeroed the requirement out statewide rather than leaving builders to navigate a conflict between two code chapters.⁸ This isn't an oversight to flag on plan review - it's the correct, current number.

For the U-factor alternative (Table R402.1.4, used instead of the R-value table when it's more convenient to work in U-factors), Georgia's amended values are:⁷

Component (max. U-factor)	Zone 2	Zone 3	Zone 4 (except Marine)
Fenestration	0.35	0.35	0.35
Skylight	0.65	0.55	0.55
Ceiling	0.030	0.030	0.030
Frame wall	0.084	0.084	0.084
Mass wall	0.165	0.098	0.098
Floor	0.064	0.047	0.047
Basement wall	0.360	0.091	0.059
Crawl space wall	0.477	0.136	0.065

Lower U-factor = better performance. Nonfenestration U-factors must come from measurement, calculation, or an approved source, not a simple 1/R conversion.⁷

Sidebar: the unvented-roof-deck alternative (R402.1.2.1)

Georgia added a formal alternative for indirectly conditioned attics, effective January 1, 2022: where the ceiling table would otherwise require R-38 (or U-0.030), an air-impermeable insulation installed to the underside or above the roof deck, at a minimum R-20 or U-0.05, is deemed equivalent - but only if all four conditions are met:⁹

1. The house achieves a blower-door result under 3 ACH50 - tighter than Georgia's general mandatory minimum (see below).
2. A whole-house mechanical ventilation system is installed that does not rely solely on negative pressure - it must be positive, balanced, or hybrid.
3. Exposed roof rafters are wrapped to at least R-3, unless a continuous insulation layer is installed above the roof deck.
4. All indoor heating, cooling, and ventilation equipment, including ductwork, is located inside the building thermal envelope.

This is closer to a spray-foam-roof-deck compliance option than an "additional efficiency package" in the 2021-IECC sense, but it functions similarly: a builder choosing an unvented, conditioned-attic assembly gets an explicit path that trades a stricter air-leakage number and mandatory balanced ventilation for relief from the R-38/U-0.030 ceiling requirement.

Air sealing - blower-door testing

Georgia's amended Section R402.4.1.2 sets a single statewide threshold:

"R402.4.1.2 Testing. All one and two-family dwelling units shall be tested and verified to less than five air changes per hour at 50 Pascals (ACH50) for Climate Zones 2, 3, and 4. Testing shall be conducted in accordance with ASTM E 779 or ASTM E 1827 or ANSI/RESNET/ICC 380 and reported at a pressure of 0.2 inch w.g. (50 Pascals). A written report of the results of the test shall be signed by the party conducting the test and provided to the code official."¹⁰

This is a genuine, mandatory, statewide requirement - and it is looser than the plain national 2015 IECC would be for Georgia's Zones 3 and 4. The unamended national 2015 IECC splits its air-leakage limit at 5 ACH50 for Zones 1-2 and 3 ACH50 for Zones 3-8. Georgia's amendment holds every one of its climate zones - including 3A and 4A - to the single, looser <5 ACH50 ceiling rather than tightening the mixed-humid and cooler zones to 3 ACH50. If you've priced a Georgia job against a generic "national 2015 IECC" air-sealing target, you may be over-building to a number Georgia doesn't actually require.

For low-rise R-2 multifamily buildings, Georgia added an alternative to the ACH50 metric: compliance can instead be shown with an Envelope Leakage Ratio at 50 Pascals (ELR50) of less than 0.35, where ELR50 = CFM50 ÷ envelope shell area in square feet.¹¹

Duct testing and leakage

Georgia's amended Section R403.3.4 sets duct leakage at 6 CFM25 per 100 square feet of conditioned floor area - for both the rough-in test (with the air handler installed, tested at a 25 Pa differential per Section R403.3.3) and the post-construction test. That is a single, looser number covering both test conditions, rather than the tiered rough-in/without-air-handler/post-construction figures used in some other states' 2015-and-later adoptions.¹²

The exemption for ducts and air handlers located entirely within the building thermal envelope carries through unchanged: no duct leakage test is required if the whole duct system is inside conditioned space. Existing duct systems are also exempt from testing unless more than 50% of the system is modified, and Georgia added a specific procedure for equipment replacements - if an air handler, furnace, or evaporator coil is swapped on an existing system, joints and connections within 5 feet of the new work must meet the sealing requirements and be verified either by a visual inspection from a state-licensed conditioned-air contractor or by a certified DET (Duct and Envelope Tightness) verifier.¹²

Georgia also added its own duct joint/seam/connection specification (Section R403.3.6): closure systems for flexible ducts must be UL 181B-listed tape or mastic, connections to equipment flanges must be both sealed and mechanically fastened, crimp joints on round metallic ducts need at least a 1-inch lap secured with a minimum of three screws or rivets, and unlisted duct tape is barred outright as a sealant on any duct, anywhere.¹³

One item worth flagging rather than relying on: a Georgia amendment effective September 1, 2022 allowed R-6 flexible duct combined with a continuous radiant barrier as part of the roof assembly to substitute for the otherwise-required R-8 flexible duct - but the amendment text states the substitution "will be valid until June 30, 2023 at the discretion of the authority having jurisdiction."¹⁴ We could not confirm in this research pass whether that window was formally extended in a later amendment round. Treat this substitution as expired unless your local plan reviewer confirms otherwise for your jurisdiction.

Mechanical ventilation

Georgia's amended Section R403.6 requires that, where mechanical ventilation is required, it meet the requirements of the IRC or IMC as applicable, or comply with ASHRAE 62.2-2016 in its entirety, or another approved means. Outdoor air intakes and exhausts need automatic or gravity dampers that close when the ventilation system isn't running.¹⁵

Where a whole-house mechanical ventilation system is installed, Georgia's Table R403.6.1 sets minimum fan efficacy: range hoods and in-line fans need at least 2.8 CFM per watt at any airflow rate; bathroom and utility-room fans need at least 1.4 CFM/watt below a 90 CFM airflow rate, stepping up to 2.8 CFM/watt at 90 CFM or above. Fans integral to tested and listed HVAC equipment are exempt from the efficacy table if powered by an electronically commutated motor.¹⁵

Energy Rating Index (ERI) targets

Georgia's amended Table R406.4 sets these maximum ERI scores - a home's Rated Design must score at or below the number for its zone to pass on the ERI path:¹⁶

Climate Zone	Georgia's Maximum ERI	Unamended national 2015 IECC ERI
2	57	52
3	57	51
4	62	54

A higher allowed ERI number is a looser target - a home doesn't have to perform as well to pass. Georgia's amended targets sit 3 to 6 points above the unamended national 2015 IECC's Table R406.4 defaults for every zone the state uses. If you're comparing an ERI/HERS score against what you've seen quoted for other states, remember Georgia's own pass/fail line is higher (easier) than the plain national number.

Certificate and equipment sizing (Mandatory, all paths)

Regardless of which compliance path is used, Section R401.3 requires a permanent certificate posted at the electrical distribution panel or air handler, listing the predominant insulation R-values, fenestration U-factor and SHGC, duct/envelope test results, and the type and efficiency of the installed heating, cooling, and water-heating equipment. Georgia requires its own form for this - Appendix RD, the "Mandatory Compliance Certificate," available from DCA's website rather than a generic national template.¹⁷

Section R403.7 (Mandatory) is the section that puts equipment sizing on the same footing as the envelope and testing requirements: "Heating and cooling equipment shall be sized in accordance with ACCA Manual S based on building loads calculated in accordance with ACCA Manual J or other approved heating and cooling calculation methodologies."¹⁸ This is the operative Georgia code text that makes a Manual J (or an equivalent, approved load-calculation method) a requirement for new HVAC systems statewide, not a courtesy step.

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3. Your Ways to Comply

Georgia's amended Section R401.2 lays out four legal paths. Picking the right one for a given project is mostly about how standard the design is and whether you're already producing an energy model or HERS rating for another reason.

Path	Code section	What it is	Best fit
Prescriptive	R401 through R404	Meet every line item in Georgia's Table R402.1.2 (or the U-factor alternative, Table R402.1.4) exactly, plus every Mandatory-labeled section.	Straightforward plans, standard framing, no unusual glazing package, tight budget for documentation.
REScheck (keyed to the 2015 IECC)	R401.2, item 4	The DOE REScheck tool, run with the 2015 IECC selected, applying a UA trade-off so a weaker component can be offset by a stronger one elsewhere in the envelope.	Plans that don't hit every prescriptive line individually - larger glazing packages, a wall assembly slightly under table, or simply the fastest path through a straightforward home.
Simulated performance	R405	A full annual energy-cost model of the proposed design compared against a standard reference design; the proposed design must come in at or below the reference.	Custom or high-end homes, non-standard HVAC or renewable-energy strategies, or designs the prescriptive/UA path can't cleanly capture.
Energy Rating Index (ERI)	R406	A HERS-style rating comparing the rated design against an ERI reference design, scored against Georgia's amended Table R406.4 targets (57 / 57 / 62 for Zones 2 / 3 / 4).	Homes already getting a HERS rating for a builder incentive, utility rebate, tax credit, or green-building certification - the rating already being paid for can satisfy code compliance too.

Honest guidance on which path fits which project

• If you're building a simple, code-minimum spec home with standard framing - the prescriptive path is the cheapest to document and the fastest through plan review, because there's nothing to argue about: the assembly either matches Georgia's table or it doesn't.
• If your glazing package, wall assembly, or floor plan doesn't clear the prescriptive table exactly - a REScheck trade-off report, run against the 2015 IECC, is usually the fastest and cheapest fix. It's a same-day document, not a multi-week energy model, and it's the path Georgia's own regulation explicitly names.
• If you're doing a custom home with non-standard HVAC, solar, or a design the prescriptive/UA path can't cleanly capture - go simulated performance (R405). It costs more and takes longer to produce, but it's the only path flexible enough for genuinely unusual designs.
• If you're already paying for a HERS rating for ENERGY STAR, a utility rebate, or the federal 45L tax credit - use the ERI path (R406) and let that rating do double duty rather than paying for a second, separate compliance document.

For the large majority of single-family production and semi-custom homes in Georgia, a REScheck report run correctly against the state's 2015 IECC baseline - not a newer national edition - is the fastest, cheapest route through plan review.

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4. Georgia-Specific Wrinkles

Georgia is now further behind the national IECC cycle than almost any other state. The current national edition is the 2024 IECC; many states have moved to 2018 or 2021. Georgia's residential energy provisions remain keyed to 2015 - and, as covered in Section 1, the state's broad January 2026 code refresh (2024 IRC, IBC, IPC, IMC, IFGC, ISPSC) explicitly did not touch the energy code.⁴ If you work in multiple states or rely on a national compliance-software default, don't assume "the current IECC" applies here - confirm the 2015 baseline for every Georgia REScheck run and Manual J compliance narrative.

Several of Georgia's amendments are looser than the plain national 2015 IECC, not stricter - which is unusual compared to most state amendment patterns and worth double-checking before over-building a Georgia job:

• Air leakage: <5 ACH50 statewide, versus the national 2015 IECC's 3 ACH50 for Zones 3-8 (Section 2, above).
• Duct leakage: 6 CFM25/100 sq ft for both rough-in and post-construction tests, a single looser figure.
• ERI targets: 57 / 57 / 62 for Zones 2 / 3 / 4, versus the national defaults of 52 / 51 / 54.
• Slab insulation: eliminated statewide (R-0) due to termite-treatment conflicts.

None of this means Georgia construction is under-built relative to its own code - these are the numbers the state deliberately chose. It does mean a spec sheet or compliance narrative written against a generic "2015 IECC" description (rather than Georgia's actual adopted tables) can misstate what the local plan reviewer will check for.

Duct and Envelope Tightness (DET) verifiers. Georgia created its own third-party verification credential for this code: a Certified DET Verifier must be a certified HERS rater, a Building Performance Institute (BPI) Analyst, hold Infiltration Duct Leakage (IDL) certification, or have completed a DCA-approved DET verifier course.²⁰ Confirm which of these your local jurisdiction actually accepts before scheduling blower-door or duct testing - acceptance isn't uniform statewide.

Climate zones - which counties are which

Georgia spans three IECC climate zones under the national county-to-zone map incorporated by reference (unmodified by Georgia's amendments):

• Zone 2A (hot-humid): the southern half of the state - the coastal plain, Savannah, Brunswick, Valdosta, Albany, and most counties south of roughly the Macon-Columbus line. An estimated 16% of Georgia's population lives in Zone 2A.²¹²²
• Zone 3A (mixed/warm-humid): the broad central band, including metro Atlanta, Augusta, Macon, Columbus, and the large majority of Georgia's counties. An estimated 82% of the state's population lives in Zone 3A - by far the most common zone for Georgia residential permits.²¹²²
• Zone 4A (mixed-humid, cooler): limited to 22 north Georgia mountain counties - Banks, Catoosa, Chattooga, Dade, Dawson, Fannin, Floyd, Franklin, Gilmer, Gordon, Habersham, Hall, Lumpkin, Murray, Pickens, Rabun, Stephens, Towns, Union, Walker, White, and Whitfield. An estimated 2% of the population lives in Zone 4A.²¹²²

A project a few miles from a county line can land in a different zone with a different prescriptive requirement (even though Georgia's compressed table keeps most values close across zones, several - basement wall, crawlspace wall, floor - do change). Confirm the exact county before finalizing a compliance document, especially for projects near the Zone 3A/4A line in north Georgia.

What to ask your local plan reviewer before you finalize a compliance strategy:

1. Which compliance path does this office prefer to see documented - prescriptive worksheet, REScheck (2015 IECC), R405 report, or an ERI/HERS certificate - and submitted with the permit application or before final inspection?
2. Who is the accepted DET verifier, HERS rater, or approved third party for blower-door and duct-leakage testing in this jurisdiction?
3. Is the R-6 flexible duct plus radiant-barrier substitution (Section 2, above) still being accepted here, given its stated expiration?
4. Does this office have any local amendments on file beyond the statewide DCA amendments, particularly for the R402.1.2.1 unvented-roof-deck alternative?
5. What form does this office expect for the R401.3 mandatory certificate - DCA's Appendix RD template, or a local equivalent?

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5. Frequently Asked Questions

Does Georgia use the current national IECC edition? No. Georgia's residential energy code is the 2015 IECC with Georgia State Supplements and Amendments (currently the 2020, 2022, 2022 Additional, and 2023 amendment rounds).¹ When Georgia refreshed its other model codes to 2024 editions effective January 1, 2026, the energy code was left out of that update - it is still keyed to the 2015 IECC base.⁴

What blower-door result do I need to pass in Georgia? Less than 5 air changes per hour at 50 Pascals (ACH50), tested per ASTM E779, ASTM E1827, or ANSI/RESNET/ICC 380, for Georgia's Climate Zones 2, 3, and 4.¹⁰ That is Georgia's amended Section R402.4.1.2, and it applies statewide regardless of which of the three zones your project sits in.

Does Georgia require slab-edge insulation? No. Georgia's amended Table R402.1.2 sets the slab R-value at 0 in every climate zone the state uses, because continuous slab-edge foam conflicts with the state's termite-treatment requirements.⁸ This does not exempt the rest of the envelope table.

Can I use REScheck to comply, and which edition do I select? Yes. Georgia's own regulation instructs REScheck users to select the 2015 IECC as the code version² - not a newer national edition, and not a separate Georgia-specific edition (none exists). Running the report against the wrong edition is a common, avoidable reason plan review sends it back.

What's the duct leakage limit for a new Georgia home? 6 CFM25 per 100 square feet of conditioned floor area, for both the rough-in test and the post-construction test, under Georgia's amended Section R403.3.4.¹² Ducts and air handlers located entirely inside the building thermal envelope are exempt from testing.

Who actually prepares my Georgia REScheck or Manual J report? Travis Smith, The Plans Examiner. He holds the same certification your building department's plan reviewer holds; the specifics are at the end of this page.

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6. Get It Right the First Time - Before Plan Review Sends It Back

Need a REScheck report? If your envelope doesn't clear Georgia's prescriptive table on the nose - or you just want the fastest, cheapest document through plan review - a REScheck report run correctly against the 2015 IECC, with inputs matched to Georgia's actual amended tables rather than a generic national template, is usually the right call. REScheck reports start at $149, prepared from your plan set.

Need a Manual J load calculation? Section R403.7 makes ACCA Manual J (or an approved equivalent) the mandatory basis for equipment sizing on every path through Georgia's code, and IRC M1401.3 backs that up on the mechanical side. Right-sizing matters even more once the envelope, air-sealing, and duct-leakage numbers above are locked in - an oversized system fights the rest of the code's air-sealing and duct requirements instead of working with them. Manual J reports start at $249, room-by-room, prepared from your plan set.

Need both? The Manual J + REScheck package is $349 for homes up to 3,000 square feet - one submission covering both the load calculation your HVAC contractor needs and the energy-code compliance document your plan reviewer needs.

Working outside Georgia? See the full state guide index for other states' REScheck and Manual J requirements.

Already been rejected? If your jurisdiction has already sent the report back, we work from the correction notice itself - see REScheck correction and resubmittal or Manual J correction and resubmittal.

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Verification Appendix

Every substantive claim on this page was checked against Georgia's actual adopted rule text (Ga. Comp. R. & Regs. R. 110-11-1-.34, as mirrored by Cornell's Legal Information Institute and cross-checked against up.codes' viewer of the same adopted code), DCA's own amendment PDFs, and DCA's own current-code announcements - not secondary blog summaries.

1. Georgia's residential energy code base edition (2015 IECC with 2020/2022/2023 GA Amendments). VERIFIED. Confirmed directly against the rule title and text at Ga. Comp. R. & Regs. R. 110-11-1-.34, and against DCA's own "Georgia State Supplements and Amendments to the [IECC] (2015 Edition), Revised January 1, 2023" PDF.

2. Energy code excluded from Georgia's January 1, 2026 code refresh. VERIFIED. DCA's December 9, 2025 "New Codes Jan 2026" announcement lists the codes moving to 2024 editions (IRC, IBC, IPC, IMC, IFGC, ISPSC, NEC amendments) and does not include the energy code; DCA's January 1, 2026 Industrialized Buildings code-reference sheet independently lists the energy code as still "2015 International Energy Conservation Code (IECC) w/ 2020, 2022 & 2023 GA Amendments" alongside the newly-adopted 2024-based codes.

3. Table R402.1.2 and Table R402.1.4 envelope values, including slab R-value = 0. VERIFIED. Both tables pulled directly from the Cornell LII mirror of Ga. Comp. R. & Regs. R. 110-11-1-.34 and cross-checked against up.codes' viewer of the same adopted Georgia 2015 IECC text; the two sources match exactly. The termite-risk rationale for the slab exemption is corroborated by Southface's DCA-endorsed "Georgia State Supplements and Amendments" air-sealing guide.

4. R402.4.1.2 air-leakage threshold (<5 ACH50, Zones 2-4). VERIFIED. Quoted directly from the adopted rule text via Cornell LII; corroborated by independent industry summaries (Energy Vanguard, GreenBuildingAdvisor) describing Georgia's testing-threshold history.

5. R403.3.3/R403.3.4 duct testing and leakage threshold (6 CFM25/100 sq ft, both tests). VERIFIED. Pulled directly from up.codes' viewer of Georgia's adopted 2015 IECC Chapter 4 [RE] text, which reproduces the Georgia-amended section verbatim with effective dates.

6. Table R406.4 Georgia ERI targets (57/57/62) versus the unamended national 2015 IECC defaults (52/51/54). VERIFIED. Georgia's table confirmed via Cornell LII and up.codes; the unamended national 2015 IECC Table R406.4 values confirmed via DOE's own 2015 IECC residential-requirements training slide deck (energycodes.gov) and a matching ICC 2016 conference presentation deck, both independent of Georgia-specific sources.

7. Climate zone county assignments (2A/3A/4A, including the 22-county Zone 4A list). VERIFIED. Cross-checked between the DOE Building America "Guide to Determining Climate Regions by County" (Volume 7.3) and an independent IECC compliance-guide document for Georgia homes; both list the identical 22 Zone 4A counties. Population-share estimates by zone are sourced to ACEEE's Georgia building energy codes documentation and are ACEEE's own modeling estimates, not a Census-published figure - presented here as an approximation, not an exact count.

8. R-6 flexible duct / radiant barrier substitution expiration (valid through June 30, 2023). UNVERIFIED past that date. The amendment text itself states the June 30, 2023 expiration; we found no primary-source confirmation in this research pass of whether a later Georgia amendment round extended it. This page treats the substitution as expired unless a local plan reviewer confirms otherwise - flagged in Section 2 and Section 4 rather than stated as current.

No items remain fully open - one item (#8) is explicitly marked unverified-as-current rather than resolved, and is presented to the reader that way rather than guessed at.

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Sources

This page summarizes Georgia's adopted energy code and amendments for general guidance. Code requirements vary by specific project, jurisdiction, and interpretation by your local plan reviewer. Always confirm current requirements with your code official before finalizing design or bidding.